The Dimlux CO2 Sensor connects to the Dimlux Maxi Controller to provide a super-accurate solution to CO2 control in your grow room. It will work with both CO2 Generators as well as bottled CO2. Unlike most sensors currently on the market, the Dimlux CO2 Sensor uses Dual Beam NDIR technology which delivers unprecedented calibration stability and accuracy. Dual Beam sensors are two sensors in one where the measuring sensor is periodically adjusted by the second sensor. Because the second sensor is active only 5 minutes per month, it does not age or drift.